In the early years of the AIDS epidemic, there was a lot of controversy about a so-called Patient Zero, who was the basis of a complex transmission scenario compiled by Dr. William Darrow and colleagues at the Centers for Disease Control (CDC) in the US. This epidemiological study showed how 'Patient Zero' had given HIV to multiple partners, who then in turn transmitted it to others and rapidly spread the virus to locations all over the world (Auerbach et al., 1984). In all, at least 40 of the 248 people diagnosed with AIDS by April 1982 were thought to have had sex either with him or with someone who had.
A journalist, Randy Shilts, subsequently wrote about Patient Zero—based on Darrow's findings—in his 1987 book And The Band Played On, which identified Patient Zero as a gay Canadian flight attendant named Gaëtan Dugas (February 20, 1953—March 30, 1984 <1>). For several years, Dugas was vilified as a "mass spreader" of HIV and the original source of the HIV epidemic among gay men. However, four years after the publication of Shilts's article, Dr. Darrow repudiated his study, admitting that its methods were flawed and claiming that Shilts had misrepresented the study's conclusions.
A 2007 study published in the Proceedings of the National Academy of Sciences by Michael Worobey and Dr. Arthur Pitchenik claimed that, based on the results of genetic analysis, HIV probably moved from Africa to Haiti and then entered the United States around 1969. <1>
http://en.wikipedia.org/wiki/Patient_Zeroand here's another piece:
At the CDC researchers had been continuing to investigate the cause of AIDS through a study of the sexual contacts of homosexual men in Los Angeles and New York. They identified a man as the link between a number of different cases and they named him "patient O" for "Out of California".68 The research appeared to confirm that AIDS was a transmittable disease, and the co-operation of "patient O" contributed to the study.69
However a problem arose when other people read the scientific paper.
"I called this guy Patient O... But my colleagues read it as Patient Zero."
- Darrow for Newsweek -70
And so in March 1984 the myth of Patient Zero began.71 See 1987 for more information about Patient Zero.
http://www.avert.org/his81_86.htm